Glad to hear you got your oil problem fixed. If you are crafty and you have a spare surplus wall wart available (120 AC volt to 12 volt DC converter) you can use it to test your tachometer. VerticalScope Inc. Tampa Marine Tuning is a boat service provider that specilized in Yamaha outboard tuning. is not in any way affiliated with Yamaha Motor Company. is an independent Yamaha enthusiast website owned and operated by VerticalScope Inc. Wondering if Nizpro is just taking the higher ECUs and bumping up the limiter. The tachometer is more than likely the problem. The Fora platform includes forum software by XenForo. looks like the only difference in the 115, 150, 175 motors was the ECU and the gear ratio of the lower unit. The CDI transmits that input to the tachometer. MikeIn your model the crank shaft position sensor (a component of the stator assembly) sends an AC voltage input to the CDI. I've found posts on line where some folks disable this system, don't know a lot about this motors's history.īTW, your posts on low oil warning and oil transfer, helped me solve my low oil warning.limp mode issue. I looked in a service manual I have and there wasn't even a mention of a rev limit circuit, unless I missed it. Doing research it seems the limiter is around 6,200, which was the max I could twist it. My question is, Yamaha F70, what rpm is the rev limiter supposed to kick in at I twisted it up to 6,500 rpm this morning and never felt the limiter. is an independent Yamaha enthusiast website owned and operated by VerticalScope Inc. Couldnt find any slick water to really wring it out, but it obviously performs much better than it did. What component sends input to the CDI to control high rpm's? Here is a quick overview of the settings and changes to my ECU by Anthony. The lower unit on the F90 is slightly ( very slightly) higher geared. The part number on the ECU for the 75 & 90 are different which is the real trick. The intake inlet has an aluminum restrictor on the F75 - on the F90 it simply is not there. While testing a new prop, I got 39 mph rpm at WOT and Marcus at Power Tech said the motor shouldn't have gotten that high and mentioned a rev limiter. The only 3 parts I could find different are the intake hose, the ECU and the lower unit.
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